A16B-1212-0182

交换机处理帧有不同的操作模式： 存储转发：交换机在转发之前必须接收整个帧，并进行检错，如无错误 再将这一帧发向目的地址。帧通过交换机的转发时延随帧长度的不同而 变化。 直通式：交换机只要检查到帧头中所包含的目的地址就立即转发该帧， 而无需等待帧全部的被接收，也不进行错误校验。由于以太网帧头的长 度总是固定的，因此帧通过交换机的转发时延也保持不变。

A16B-1212-0182

联系人：郭先生
联系电话：18971415643《优先》
座机：027-83238871
传真：207-61537051
QQ：810334512《优先》

A16B-1212-0182

注意：生成树协议在交换机上一般是默认开启的，不经人工干预即可正 常工作。但这种自动生成的方案可能导致数据传输的路径并非最优化。 因此，可以通过人工设置网桥优先级的方法影响生成树的生成结果。 生成树的状态： 运行生成树协议的交换机上的端口，总是处于下面四个状态中的一个。 在正常操作 期间，端口处于转发或阻塞状态。当设备识别网络拓扑结 构变化时，交换机自动进行状态转换，在这期间端口暂时处于监听和学 习状态。

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